Xyris involucrata Xyris involucrata Nees in J. Bot. (Hooker) 2: 397. 1840 sec. Charles N. Horn & al. 1994≡Xyris asterocephala Seub. in Mart., Fl. Bras. 3: 219. 1855Lectotype: Rob. Schomburgk Ser. I 1054 (; isolectotypes: , L)